Abdominal exerciser



FIG. 1 is a left, top perspective view of an abdominal exerciser showingmy design therefore;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof, the left side beingidentical;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof.

The ornamental design for an abdominal exercise, as shown and described.